What type of line is used to represent the outline of an object in a drawing?

The type of line used to represent the outline of an object in a drawing is the object line. Object lines are typically solid and dark, making them easily distinguishable from other line types. They define the visible edges and contours of an object, providing a clear representation of its shape and form. This clarity is essential in technical drawings, as it allows viewers to understand the dimensions and relationships of the parts being depicted.

In contrast, hidden lines indicate edges that are not visible from the current viewpoint, center lines show axes of symmetry or rotation, and construction lines serve as guides during the sketching and drafting process but are not part of the final representation. The distinction among these lines helps convey different aspects of the design clearly and effectively.